Repository : ssh://git@open-mesh.org/doc

On branches: backup-redmine/2017-07-13,master

commit 6ac1faf4d1721c27f9f79ddb07ddcb5afc161192 Author: Simon Wunderlich sw@simonwunderlich.de Date: Sun Oct 18 16:39:32 2009 +0000

doc: open-mesh/Emulation: add some links and references

6ac1faf4d1721c27f9f79ddb07ddcb5afc161192 open-mesh/Emulation.textile | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/open-mesh/Emulation.textile b/open-mesh/Emulation.textile index faf035b6..c9d3bd50 100644 --- a/open-mesh/Emulation.textile +++ b/open-mesh/Emulation.textile @@ -1,15 +1,15 @@ = Emulation Setup =

-As a lot of people discussed about simulating mesh network protocols, i'd like to share my qemu setup which i used to gather some data for batman-adv. The idea is to use [http://www.qemu.org/ QEMU] or [http://user-mode-linux.sourceforge.net/ UML] (instead of frameworks like they exist for [http://www.isi.edu/nsnam/ns/ NS-2]) to run an unmodified linux system with the unmodified source code. Besides BATMAN, you could evaluate any routing protocol. +As a lot of people discussed about simulating mesh network protocols at [http://hackerspace.be/Wbm2009v2/ WBMv2], i'd like to share my qemu setup which i used to gather some data for batman-adv. The idea is to use [http://www.qemu.org/ QEMU] or [http://user-mode-linux.sourceforge.net/ UML] (instead of frameworks like they exist for [http://www.isi.edu/nsnam/ns/ NS-2]) to run an unmodified linux system with the unmodified source code. Besides BATMAN, you could evaluate any routing protocol.

== Architecture ==

My system consists of the following components:

- * OpenWRT, kamikaze trunk version for x86 with minimal modifications (see below) - * one (unmodified) QEMU instance per host - * one (modified, see below) vde_switch per instance. You need multiple instances to allow interconnection with wirefilter - * one (unmodified) wirefilter per link between host. + * [http://openwrt.org/ OpenWRT], kamikaze trunk version for x86 with minimal modifications (see below) + * one (unmodified) [http://www.qemu.org/ QEMU] instance per host + * one (modified, see below) [http://wiki.virtualsquare.org/index.php/VDE_Basic_Networking vde_switch] per instance. You need multiple instances to allow interconnection with wirefilter + * one (unmodified) [http://wiki.virtualsquare.org/index.php/VDE#wirefilter wirefilter] per link between host.

=== OpenWRT ===

@@ -57,6 +57,8 @@ A sample openwrt image can be found here:

=== vde_switch ===

+The main advantage of [http://wiki.virtualsquare.org/index.php/VDE_Basic_Networking vde_switch] over [http://user-mode-linux.sourceforge.net/old/networking.html uml_switch] is that any clients can be attached to this virtual switch: QEMU, UML, tap interfaces, virtual interconnections, and not just UML instances. + If the vde_switches were just connected with wirefilter "patch cables" without modification, we would end up creating a broadcast domain and switch loops which we don't want: The goal is to allow the packets to travel only from one host to it's neighbor, not farther.

To accomplish this, i've modified the vde_switch to have "coloured" ports. The idea is: